Help identifying plant?

[BKHpondcritters]

Does anyone recognize this aquatic plant? Some details - It's perennial, but tender (does not overwinter outside in my current Zone 7a) Overwinters & thrives indoors as a house plant. I purchased it at a nursery over 15 years ago & it's been with me ever since, traveling from the Chicago suburbs to the rural mountains of western NC. Habit is mounding/trailing, & its stems will root in the ground if it creeps out of its pot or the pond. I generally keep it with the crown just above or at the water's surface. Flowers year round if brought in or kept indoors (we always keep a pot in out indoor 'pond' but also move a pot full outside for the summer) It's so dependable, I don't worry about losing & having to replace it, but... it just bothers me that I don't know what to call it other than "that yellow flowering thing".

 

[Lisak1]

Maybe an oxeye? A trilobata of some kind I would guess...

 

[BKHpondcritters]

Maybe an oxeye? A trilobata of some kind I would guess...

OMG! That's it!!! Thank you! Like I said, I was never worried about 'losing' it, but it's been driving me crazy for the past decade or so that I had NO idea what this plant was. Sphagneticola trilobata for the win!!

 

[Jhn]

Nice looking plant, like the flowers too.